Cinnabar Island is a volcanic island that is southwesterly situated in Kanto.

As an island, it entails that players must travel asea for their initial visits; this entails access to a HM03 (Surf) and a Surf-wielding Pokémon on-hand or another navigational device.

It is tenanted by Cinnabar Gym—the seventh gym in Kanto's successional line. Once you have been bestowed the Volcano Badge by Blaine, you may retread to Viridian City for the eighth and final badge from Viridian Gym.

In addition to the aforementioned gym, it subsumes other notable intrasites in Cinnabar Mansion and Cinnabar Lab.

Notable miscellanies

Cinnabar Lab

Cinnabar Lab serves as a polestar for various Pokémon professors and scientists that prefer to work seclusively, allowing them to work in an islanded environment from the rest of the region's mainland.

Most notably, the lab is home to many NPCs of interest, two of which are important in obtaining particular Pokemons, most notably Fossil Pokémons and Porygon. However, the room in which those two NPCs are located in, Cinnabar Lab Room 3, will be blocked by a guard that will refuse to leave until the Cinnabar Gym has been completed.

In Cinnabar Lab Room 1, an NPC will evaluate the player's Pokedex. Should the player have the caught data of over 100 Pokémons, he will offer a Silver Disc as a one-time reward.

Regardless of how the Silver Disc was obtained, Davis in Cinnabar Lab Room 3 will convert the Silver Disc into a Porygon of level 5, again with the requirement of over 100 caught data. This process will require him a random time of between 2 and 6 hours to complete, and so the player will be required to return the next day or later in order to claim the Porygon.

There are two Move Tutors located in the Cinnabar Lab, although only one is functionnal. The non-functionnal one, located in Cinnabar Lab Room 1, explains that he will teach Metronome for 8,000, however due to the move not being functionnal, he asks to come again later.

The other Move Tutor, located in Cinnabar Lab Room 3, will teach the move Gyro Ball to any compatible Pokémon for the price of 15,000.

Professor Oak (boss)

Professor Oak can be found in Cinnabar Lab Room 2. He will fight the player, given that he has a full party of 6 level 100 pokemons and has at least 200 seen data in his Pokédex. See the main entry for more details.

Cinnabar Mansion

Cinnabar Mansion, more putatively known as Pokémon Mansion, is a derelict, incinerated mansion found on this island. Despite its decreptitude, it is still bustled with wild Pokémon, conducing it as a popular pre-Blaine training area and general hunting area for a bevy of the rarerFire-type Pokémon.

This mansion is antecedently accessed before Cinnabar Gym is accessibilized, as the gym's key is sequestered in this mansion.

Officer Jenny's bounties

Just like in Viridian City, there is an Officer that gives small quests called "bounties". Found in the north-west shore of the island, she gives the following bounties:

Fight Articuno: This bounty requires the player to obtain the seen data of Articuno. This can be done by fighting Articuno at Seafoam Islands B4F. The reward for completing this bounty is 12,000.

Revive a Fossil: This bounty requires the player to revive any Fossil at the nearby Laboratory. As long as the Pokemon is of the player's OT, Officer Jenny will accept any of the followings: Kabuto, Kabutops, Omanyte, Omastar and Aerodactyl. The Pokemon is also not lost upon completing the bounty. The reward for completing this bounty is 6,000 and a Hard Stone.

Catch a Corsola: This bounty requires the player to catch a Corsola. They can be found by surfing at Cinnabar Island, however like Jenny warns, they do not appear during the night. The Corsola is also not lost upon completing the bounty. The reward for completing this bounty is 10 Lure Balls.

The player may accept any bounty at the same time, but each bounty can only be completed once.

Sailor

A Sailor is waiting immediately in front of the Pokemon Center. He will take the player directly to Route 19's beach for the price of 2,500, or for free if the player has an active Transit Pass. However, he only offers the service to those that have completed the Transit Quest and the Kanto Elite Four.

Items

Cinnabar Gym

Whereupon the Secret Key is procured in Cinnabar Mansion, Cinnabar Gym will be unlocked. It rewards the Volcano Badge to victorious challengers, which is a prerequisite for accessibilizing Viridian Gym in order to acquire the eighth and final badge in Kanto's sequential line in the Earth Badge.

It is a two-story site, comprising ground floor and a subterranean floor: the ground floor is occupied by gym-trainers that must be waded through in order to reach the basement floor, whereas the basement floor is inhabited by Blaine. Once the gauntlet of ground-floor trainers have been beaten, Blaine will be encountered, beckoning the trainer to follow him downstairs for the impending gym battle.

The gym-greeter will sell TM85 (Flamethrower) upon reaping the Volcano Badge. He sells it in quantities of one for 3,000 and five for 12,000.

Blaine

As the most advantageous counterforce against Fire-type Pokémon, conventional wisdom dictates that Water-type should be culled for the battle. If there is a dearth of Water-type Pokémon in your possession, they can be cobbled together locally by surfing and fishing, as they ambiently inhabit Cinnabar Island and the contiguous water routes.

Rock-type Pokémon are additionally practicable, especially against his Charizard where they are doubly advantageous against its dual type.